United States Patent (19) 11 Patent Number: 4,886,691 Winckhofer (45) Date of Patent: Dec
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United States Patent (19) 11 Patent Number: 4,886,691 Winckhofer (45) Date of Patent: Dec. 12, 1989 (54. CUT RESISTANT JACKET FOR ROPES, (56) References Cited WEBBING, STRAPS, INFLATABLES AND U.S. PATENT DOCUMENTS THE LIKE 4,321,854 3/1982 Foote et al. ........................... 57/210 4,384,449 5/1983 Byrnes et al. ......................... 57/210 75 Inventor: Robert C. Winckhofer, Richmond, 4,470,251 9/1984 Beltcher ................................ 57/210 Va. 4,651,514 3/1987 Collett ................................... 57/227 73 Assignee: Allied-Signal Inc., Morris Township, FOREIGN PATENT DOCUMENTS Morris County, N.J. 0027708 10/1980 European Pat. Off. 0050011 10/1981 European Pat. Off.. (21 Appl. No.: 277,486 0133205 6/1984 European Pat. Off. 0168774 7/1985 European Pat. Off. 7906321 3/1979 Fed. Rep. of Germany. (22 Filed: Nov. 29, 1988 8313102 6/1983 Fed. Rep. of Germany . Primary Examiner-James J. Bell Related U.S. Application Data Attorney, Agent, or Firm-Richard A. Anderson 63 Continuation-in-part of Ser. No. 140,530, Jan. 4, 1988, abandoned, which is a continuation-in-part of Ser. No. 57 ABSTRACT 873,669, Jun. 12, 1986, abandoned. This invention is a cut resistant article comprising a cut resistantjacket surrounding a less cut resistant member. 51) Int. Cl."................................................ B32B 1/04 The jacket comprises a fabric of yarn and the yarn 52 U.S. C. .......................................: 428/68; 57/210; consists essentially of a high strength, longitudinal 27/6; 428/224; 428/229; 428/253; 428/257; strand having a tensile strength of at least 1 GPa. The 428/902 strand is wrapped with another fiber or the same fiber. 58 Field of Search ..................... 428/68, 74, 76,224, 428/229, 257, 253,373, 902; 57/210; 87/6 13 Claims, No Drawings 4,886,691 M 1. 2 outer layer. The strand used for the fiber in the jacket CUT RESISTANT JACKET FOR ROPES, may be selected from the group consisting of anaramid, WEBBING, STRAPS, INFLATABLES AND THE ultrahigh molecular weight polyolefin, carbon, metal, LKE fiberglass and combinations thereof. The fiber used to 5 wrap the longitudinal strand (or strands) can be selected This application is a continuation of application Ser. from the group consisting of an aramid fiber, ultrahigh No. 140,530 filed Jan. 4, 1988 now abandoned which is molecular weight polyolefin fiber, carbon fiber, metal a continuation-in-part of Ser. No. 873,669, filed June 12, fiber, polyamide fiber, polyester fiber, normal molecu 1986, now abandoned. lar weight polyolefin fiber, fiberglass, polyacrylic fiber O BACKGROUND OF THE INVENTION and combinations thereof. When the fiber wrapping is a high strength fiber having strength over 1 GPa, the This invention relates to a cut resistant jacket for ropes, webbing, straps, inflatables and the like, more preferred fiber wrapping is selected from the group particularly a cut resistant article comprising a cut resis consisting of aramid fiber, ultra high molecular weight tant jacket surrounding a less cut resistant member 15 polyolefin fiber, carbon fiber, metal fiber, fiberglass and where the jacket comprises a fabric of a yarn and the combinations thereof. yarn consists essentially of a high strength, longitudinal The polyolefin fiber of this invention can be ultrahigh strand having a tensile strength of at least 1 GPa and the molecular weight polyethylene or polypropylene, pref. strand is wrapped with a fiber. erably polyethylene, commercial examples are Spec It is known to make cut resistant fabric for gloves 20 tra (R900 or Spectra (R1000. used for safety in the meat cutting industry. For exam The fiber wrapping can also be a blend of a lower ple see U.S. Pat. No. 4470 251, U.S. Pat. No. 4384. 449 strength fiber with the high strength fiber. Such lower and U.S. Pat. No. 4 004 295 all hereby incorporated by strength fiber can be selected from the group consisting reference. It is also known to make a composite line of polyamide, polyester, fiber glass, polyacrylic fiber containing two different filamentary materials in the 25 and combinations thereof. form of a core and a jacket of different tensile strengths The article of this invention can also have more than and elongations as in U.S. Pat. No. 4 321 854 hereby one jacket surrounding the less cut resistant member. incorporated by reference. It is also known to make In another embodiment, the article of this invention composite strand, cables, yarns, ropes, textiles, filaments has a material present in the interstices of the fabric of and the like in other prior U.S. patents not cited herein. 30 the jacket to bond the yarn of the fabric to adjacent By ultrahigh molecular weight is meant 300,000 to yarn of the fabric thereby increasing penetration resis 7,000,000. Normal molecular weight is then below tance of the jacket. The material used in the interstices 300,000. can be any elastomer, preferably a thermoplastic rubber By fiber herein is meant any thread, filament or the and more preferably a material selected from the group like, alone or in groups of multifilaments, continuous 35 consisting of polyurethane, polyethylene and polyvinyl running lengths or short lengths such as staple. chloride. By yarn herein is meant any continuous running length of fibers, which may be wrapped with similar or DESCRIPTION OF THE PREFERRED dissimilar fiber, suitable for further processing into fab EMBODIMENTS ric by braiding, weaving, fusion bonding, tufting, knit 40 Yarns for Jacket Fabric ting or the like, having a denier less than 10,000. A yarn to be used to make the protective jacket fabric By strand herein is meant either a running length of is made by wrapping one longitudinal strand of stainless multifilament end or a monofilament end of continuous steel wire having a diameter of 0.11 mm and one parallel fiber or spun staple fibers, preferably untwisted, having strand of an ultrahigh molecular weight polyethylene a denier less than 2,000, or metal of diameter less than 45 fiber having a tensile strength of 3 GPa modulus of 171 0.01 inches. GPa, elongation of 2.7 percent, denier of 650 and 120 SUMMARY OF THE INVENTION filaments per strand or end. This yarn is commercially This invention is a cut resistant article comprising a available as Spectra (R)1000 fiber from Allied Corpora cut resistantjacket surrounding a less cut resistant mem 50 tion. The wrapping fiber is a polyester of 500 denier, 70 ber. The jacket comprises a fabric of yarn. The yarn filaments per end, having a tensile strength of 1.00 GPa, consists essentially of a high strength, longitudinal modulus of 13.2 GPa, elongation of 14 percent. For strand having a tensile strength of at least 1 GPa. More yarn. A two layered wraps of the above polyester fiber than one strand can be used. This strand (or strands) is are used to wrap the parallel strands of wire and high wrapped with a fiber. The fiber may be the same or 55 strength polyethylene. different than the longitudinal yarn. For yarn B one layer of the ultrahigh molecular It is preferred that the fiber wrapped around the weight polyethylene fiber described above is used as the strand also have a tensile strength of at least 1 GPa. innermost layer wrapped around the strands, the outer The less cut resistant member can be selected from layer being the polyester fiber. the group consisting of rope, webbing, strap, hose and Alternatively, an aramid such as Kevlar could be inflatable structures. used to replace the ultrahigh molecular weight polyeth The core strand fiber of the rope, webbing, strap or ylene, either as the strand or as the fiber for wrapping. inflatable structures could be fiber of nylon, polyester, Comparative Yarn C-a polyester of 3600 denier, 1. polypropylene, polyethylene, aramid, ultrahigh molec GPa tensile strength, 13.2 GPa modulus and 14 percent ular weight high strength polyethylene or any other 65 elongation, without wrapping. known fiber for the use. This wrapped yarn (A or B) or comparative yarn C The inflatable structure would be a less cut resistant can then be braided, knitted, woven or otherwise made layer having the fabric of this invention as a jacket or into fabric used as the jacket of this invention. 4,886,691 3 4. This jacket can then be used to surround ropes, web was pressed. There was no evidence of even the jacket bing, straps, inflatable structure, and the like. The jacket having been cut. Because of this only Sample 3 rope can be made from one or more ends of yarn per carrier was tested at 500 pounds force in the cut damage test. It in the braider apparatus. Either full or partial coverage retained 92 percent strength and sustained no jacket of the core of braided or parallel strands can be cutting. achieved. The yarn for the fabric used for the jacket in this invention can also be wrapped in a conventional EXAMPLE 2 manner such as simply wrapping the strand of high strength fiber or by core spinning or by Tazalanizing or Abrasion Resistance any other method to put a wrap of yarn around the 10 Comparative Sample 2 and Sample 3 (this invention) strand or strands. were tested for abrasion resistance of the jacket by the test described below. Sample 3 was a -inch (0.6 cm) EXAMPLE 1. stranded rope jacketed with a braided fabric of yarn A. Tests on Ropes In the test each sample rope was bent in a 90 degree Three different stranded ropes, jacketed with a cut 15 angle over a 10-inch (25.3 cm) diameter abrasive wheel.